A gas pipeline leak shut-off device

Abstract

This invention discloses a gas pipeline leakage self-closing device, belonging to the field of gas pipeline equipment. It includes a pipeline with two sets of pipes, each with a fixing ring fixedly connected to its opposite outer side. A mounting frame is fixedly connected to the outer side of each pipe. The device also includes a ventilation mechanism, comprising two sets of air inlet pipes fixedly connected to the mounting frame. Each set of air inlet pipes has a support plate fixedly connected inside, and a fan is rotatably connected to each support plate. A rotating rod is fixedly connected between the two fans, and a sliding rod is slidably connected to the rotating rod. Rotating plates are evenly fixedly installed on the sliding rod. Ventilation openings are evenly distributed on the mounting frame. The fan rotation allows airflow to one side within the mounting frame. This allows for ventilation of the pipeline while simultaneously cleaning dust from the outer wall, preventing dust abrasion and oxidation of the pipeline's outer wall and avoiding the problem of dust accumulation severely affecting heat dissipation.

Description

Technical Field

[0001] This invention relates to the field of gas pipeline equipment, and more specifically, to a gas pipeline leakage shut-off device. Background Technology

[0002] A gas pipeline leak shut-off device is a gas safety device used to detect gas leaks in gas pipelines and automatically cut off the gas supply when a leak is detected, thereby preventing safety accidents caused by gas leaks. This device typically consists of a leak detector, an automatic valve, and an alarm. The leak detector can sense changes in the gas concentration in the gas pipeline. Once a leak is detected, it sends a command to the automatic valve to automatically cut off the gas supply. At the same time, the alarm will emit audible and visual signals to remind the user to pay attention to safety.

[0003] Automatic shut-off valves are installed on gas system pipelines. When the gas supply pressure in the pipeline is low, high, or the flow is abnormal, they can automatically shut off without electricity or other external power to ensure the safe use of gas. However, the internal structure of existing automatic shut-off valves is complex. Most of them use a pull rod structure to trigger the opening and closing of the valve core, resulting in low control accuracy. They cannot meet the needs of different environments and have poor adaptability, which affects the safety performance of automatic shut-off valves.

[0004] Chinese patent CN213900019U discloses a self-closing safety valve for pipeline gas. When the gas pressure is too low, and the pressure is less than the attraction between the magnet and the disk, the magnet moves the pull rod and the hard seal body downward under its own weight, completing the closing action. When the gas pressure is too high, the diaphragm moves the pull rod upward. Under the action of the disk, the magnet moves the hard seal body upward. During the upward movement, the baffle blocks the upward movement of the hard seal body, causing the disk and the magnet to separate. Under the action of gravity, the hard seal body moves downward and forms a seal with the valve seat to complete the closure, preventing accidents and ensuring excellent safety.

[0005] To address the aforementioned issues, existing patents offer solutions that seal the pipes by adjusting the pressure within the pipes. However, the pressure of the gas inside the pipes can fluctuate due to ambient temperature, potentially leading to mis-sealing and affecting performance. Furthermore, prolonged exposure to the elements causes dust to accumulate on the pipe's outer wall, resulting in wear and oxidation that compromises its sealing. Severe dust buildup can impair heat dissipation, leading to increased pipe temperature and higher gas pressure, potentially causing fires and explosions.

[0006] Therefore, a gas pipeline leakage self-closing device is proposed. Summary of the Invention

[0007] In view of the problems existing in the prior art, the purpose of this invention is to provide a gas pipeline leakage self-closing device, which can ventilate the pipeline while cleaning the dust on the outer wall of the pipeline, thereby avoiding the wear and oxidation of the outer wall of the pipeline by dust and the problem that dust accumulation seriously affects the heat dissipation of the pipeline.

[0008] To solve the above problems, the present invention adopts the following technical solution.

[0009] A gas pipeline leakage shut-off device includes a pipeline with two sets of pipes. A retaining ring is fixedly connected to the outer side of each set of pipes on opposite sides. A mounting frame is fixedly connected to the outer side of each pipe.

[0010] Also includes:

[0011] The ventilation mechanism includes two sets of air inlet pipes fixedly connected to the mounting frame. Each set of air inlet pipes has a support plate fixedly connected inside it. Each set of support plates has a fan rotatably connected to it. A rotating rod is fixedly connected between the two sets of fans. A sliding rod is slidably connected to the rotating rod. Rotating plates are evenly fixedly installed on the sliding rod. Ventilation openings are evenly distributed on the mounting frame. By rotating the fans, airflow can be directed to one side within the mounting frame, achieving ventilation and cooling of the pipes within the mounting frame.

[0012] The reciprocating drive mechanism includes an elastic plate rotatably mounted on one side of the sliding rod. The elastic plate is elastically slidably connected to the support plate. A stop rod is fixedly connected to the side of the sliding rod near the elastic plate. One end of the stop rod contacts an inclined block, which is fixedly connected to the support plate. The ventilation mechanism and the reciprocating drive mechanism cooperate with each other. When the fan rotates, it can drive the sliding rod to reciprocate left and right, so as to facilitate better cleaning of the pipe surface later.

[0013] Furthermore, each set of rotating plates has a slot at the other end, and a T-shaped plate is rotatably installed in each slot. A first airbag is installed between each set of T-shaped plates and the inner walls on both sides of the slot. An elastic brush head is slidably installed at the bottom of each set of T-shaped plates. A movable cavity is opened in each set of T-shaped plates. An air outlet pipe is installed at the air outlet end of each set of first airbags. The other end of each set of air outlet pipes is connected to the interior of the adjacent movable cavity. Air blowing ports are evenly opened at the bottom of each set of T-shaped plates.

[0014] Furthermore, each set of elastic brush heads has a cavity at its bottom end, an exhaust port is evenly provided at the bottom end of each set of elastic brush heads, and friction blocks are evenly fixedly connected to the bottom outer wall of each set of elastic brush heads.

[0015] Furthermore, springs are installed between each set of elastic brush heads and the inner top wall of the adjacent movable cavity.

[0016] Furthermore, elastic membranes are installed on both sides of the fixing ring and between it and the pipe. Annular plates are fixedly installed on both sets of elastic membranes, and both sets of annular plates are slidably connected to the fixing ring and the adjacent pipe.

[0017] Furthermore, a second airbag is installed on the top of the fixed ring, and through grooves are connected to the sliding groove between the annular plate and the fixed ring. The other end of both sets of through grooves is connected to the air outlet of the second airbag. A stop plate is provided above the second airbag, and the stop plate is fixedly connected to the sliding rod.

[0018] Furthermore, a sealing plate is rotatably installed inside one side of the pipe, and sealing balls are installed on the outer wall of the sealing plate and the bottom rotating shaft.

[0019] Furthermore, a T-shaped toothed plate is slidably connected to one side wall of the mounting frame, a gear is fixedly connected to the bottom of the rotating shaft of the sealing plate, the gear meshes with the T-shaped toothed plate, and a conductive spring is installed between the T-shaped toothed plate and the mounting frame.

[0020] Furthermore, contact blocks are installed between the opposite sides of the two sets of annular plates and the bottom of the adjacent pipes, and the two adjacent sets of contact blocks are connected in series with conductive springs.

[0021] Furthermore, a third airbag is installed between the T-shaped toothed plate and the pipe, and the air outlet of the third airbag is connected to the interior of the two sets of sealing balls.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] (1) This solution, through the cooperation of the ventilation mechanism and the reciprocating drive mechanism, can clean the surface of the pipe while ventilating and dissipating heat from the pipe. It can effectively prevent the accumulation of dust from seriously affecting heat dissipation and avoid the wear and oxidation of the outer wall of the pipe by dust.

[0024] (2) This solution increases the friction between the elastic brush head and the pipe by setting the friction block, which can enable the elastic brush head to drive the T-shaped plate to deflect left and right and squeeze the first air bag, thus cleaning the surface of the elastic brush head and effectively improving the cleaning effect.

[0025] (3) When the elastic brush head of this solution moves left and right on the surface of the pipe, it will squeeze its own bottom end, which can realize the gas in the squeeze cavity is discharged through the exhaust port. While cleaning the surface of the pipe, it blows air on the surface, which can effectively improve the cleaning effect of the pipe.

[0026] (4) By setting the spring, the elastic brush head can be vibrated when the rotating plate rotates and drives the elastic brush head away from the surface of the pipe. This can shake off the dust remaining on the surface of the elastic brush head, effectively avoid impurities remaining on the surface of the elastic brush head, and effectively improve the performance.

[0027] (5) This solution can achieve self-sealing of the pipeline when there is air leakage by setting a conductive spring. At the same time, the pressure inside the sealing ball is increased, which can improve the sealing performance and thus improve safety. Attached Figure Description

[0028] Figure 1 This is a three-dimensional view of the entire invention;

[0029] Figure 2 This is a cross-sectional view of the mounting frame of the present invention;

[0030] Figure 3 For the present invention Figure 2 Enlarged view of the structure of section A in the middle;

[0031] Figure 4 This is a cross-sectional view of the air inlet pipe of the present invention;

[0032] Figure 5 This is an overall sectional view of the structure of the present invention;

[0033] Figure 6 For the present invention Figure 5 Enlarged view of the structure of section B in the middle;

[0034] Figure 7 For the present invention Figure 6 Enlarged view of the structure of section C;

[0035] Figure 8 For the present invention Figure 7 Enlarged view of the structure of section D in the middle;

[0036] Figure 9 For the present invention Figure 5 Enlarged view of the structure of section E in the middle.

[0037] Explanation of the labels in the diagram:

[0038] 1. Pipe; 2. Fixing ring; 3. Mounting frame; 4. Air inlet pipe; 5. Support plate; 6. Fan; 7. Rotating rod; 8. Sliding rod; 9. Rotating plate; 10. Elastic plate; 11. Inclined block; 12. Support rod; 13. Slot; 14. T-shaped plate; 15. Movable cavity; 16. First airbag; 17. Air outlet pipe; 18. Elastic brush head; 19. Spring; 20. Exhaust port; 21. Air blowing port; 22. Friction block; 23. Cavity; 24. Elastic membrane; 25. Annular plate; 26. Second airbag; 27. Support plate; 28. Through groove; 29. ​​Sealing plate; 30. Sealing ball; 31. Gear; 32. T-shaped toothed plate; 33. Conductive spring; 34. Third airbag; 35. Contact block. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] Please see Figures 1 to 9 A gas pipeline leakage shut-off device includes a pipeline 1, which has two sets of fixing rings 2 fixedly connected to the outer sides of opposite sides of the two sets of pipelines 1, and an installation frame 3 fixedly connected to the outer side of the pipeline 1.

[0041] Also includes:

[0042] The ventilation mechanism includes two sets of air inlet pipes 4 fixedly connected to the mounting frame 3. Each set of air inlet pipes 4 has a support plate 5 fixedly connected inside it. Each set of support plates 5 is rotatably connected to a fan 6. A rotating rod 7 is fixedly connected between the two sets of fans 6. A sliding rod 8 is slidably connected to the rotating rod 7. Rotating plates 9 are evenly fixedly installed on the sliding rod 8. Ventilation openings are evenly opened on the mounting frame 3. By rotating the fan 6, the airflow in one direction within the mounting frame 3 can be realized, which can realize ventilation and cooling of the pipes 1 within the mounting frame 3.

[0043] The reciprocating push mechanism includes an elastic plate 10 rotatably mounted on one side of the sliding rod 8. The elastic plate 10 is elastically slidably connected to the support plate 5. A stop rod 12 is fixedly connected to the side of the sliding rod 8 near the elastic plate 10. One end of the stop rod 12 contacts an inclined block 11. The inclined block 11 is fixedly connected to the support plate 5. The ventilation mechanism and the reciprocating push mechanism cooperate with each other. When the fan 6 rotates, it can drive the sliding rod 8 to reciprocate left and right, so as to facilitate better cleaning of the surface of the pipe 1 later.

[0044] By adopting the above technical solution, the rotation of the two sets of fans 6 can ventilate the installation frame 3 and blow the gas out in the wind direction, which can realize the ventilation and heat dissipation of the pipe 1, and prevent the pipe 1 from becoming too hot and causing the internal pressure of the pipe 1 to rise. The fan 6 drives the sliding rod 8 to rotate through the rotating rod 7, and at the same time drives the abutment rod 12 to rotate. When one end of the abutment rod 12 contacts the inclined block 11, the inclined surface of the inclined block 11 can squeeze the abutment rod 12 to the left, and the sliding rod 8 can move to the left to squeeze the elastic plate 10. When one end of the abutment rod 12 moves away from the inclined block 11, the elastic plate 10 can push the sliding rod 8 to the right under the elastic action of the elastic plate 10. At this time, the sliding rod 8 can rotate and move back and forth left and right at the same time, thus cleaning the surface of the pipe 1 while moving left and right. This effectively prevents the accumulation of dust from seriously affecting heat dissipation, and avoids the wear and oxidation of the outer wall of the pipe 1 by dust, which can effectively improve the performance.

[0045] like Figure 3 and Figure 7 As shown, each set of rotating plates 9 has a slot 13 at the other end, and a T-shaped plate 14 is rotatably installed in each set of slots 13. A first airbag 16 is installed between each set of T-shaped plates 14 and the inner walls on both sides of the slot 13. An elastic brush head 18 is slidably installed at the bottom of each set of T-shaped plates 14. A movable cavity 15 is opened in each set of T-shaped plates 14. An air outlet pipe 17 is installed at the air outlet end of each set of first airbags 16. The other end of each set of air outlet pipes 17 is connected to the interior of the adjacent movable cavity 15. Air blowing ports 21 are evenly opened at the bottom of each set of T-shaped plates 14.

[0046] By adopting the above technical solution, the fan 6 drives the sliding rod 8 to rotate via the rotating rod 7, which enables the rotating plate 9 to drive the elastic brush head 18 to rotate via the T-shaped plate 14. When the sliding rod 8 drives the elastic brush head 18 to move left and right on the surface of the pipe 1, the elastic brush head 18 can deflect left and right during its left and right movement. This allows the elastic brush head 18 to drive the T-shaped plate 14 to deflect left and right within the slot 13 and squeeze the first airbag 16. The air outlet of the first airbag 16 can blow air into the active cavity 15 through the air outlet pipe 17. The gas can be discharged through the air outlet 21 to clean the surface of the elastic brush head 18, thereby improving the cleaning effect.

[0047] like Figure 8 As shown, each set of elastic brush heads 18 has a cavity 23 at its bottom end, and each set of elastic brush heads 18 has an exhaust port 20 evenly distributed at its bottom end. Friction blocks 22 are evenly fixedly connected to the bottom outer wall of each set of elastic brush heads 18.

[0048] By adopting the above technical solution, when the elastic brush head 18 moves left and right on the surface of the pipe 1, the friction block 22 can increase the friction with the pipe 1. At the same time, the elastic brush head 18 will repeatedly squeeze the bottom end of the elastic brush head 18 during the left and right movement, which can make the gas in the squeeze cavity 23 discharged through the exhaust port 20. This can clean the surface of the pipe 1 while blowing air onto its surface, which can blow away the dust remaining on the surface of the pipe 1, effectively improving the cleaning efficiency.

[0049] like Figure 7 As shown, each set of elastic brush heads 18 is equipped with a spring 19 between it and the inner top wall of the adjacent movable cavity 15.

[0050] By adopting the above technical solution, when the rotating plate 9 rotates and drives the elastic brush head 18 away from the surface of the pipe 1, the elastic brush head 18 can be driven to return to its initial position under the action of the spring 19. This can vibrate the elastic brush head 18, shake off the dust remaining on the surface of the elastic brush head 18, and effectively improve the cleaning effect of the elastic brush head 18.

[0051] like Figure 2 , Figure 5 and Figure 6 As shown, elastic membranes 24 are installed on both sides of the fixing ring 2 and between the fixing ring 2 and the pipe 1. Annular plates 25 are fixedly installed on both sets of elastic membranes 24. Both sets of annular plates 25 are slidably connected to the fixing ring 2 and the adjacent pipe 1.

[0052] A second airbag 26 is installed on the top of the fixed ring 2. A through groove 28 is connected to the sliding groove between the annular plate 25 and the fixed ring 2. The other end of the two sets of through grooves 28 is connected to the air outlet of the second airbag 26. A stop plate 27 is provided above the second airbag 26. The stop plate 27 is fixedly connected to the sliding rod 8.

[0053] By adopting the above technical solution, the sliding rod 8 rotates while driving the abutment plate 27 to rotate. When the abutment plate 27 contacts the second airbag 26, it can squeeze the second airbag 26. The air outlet of the second airbag 26 blows air through the through groove 28 to the sliding groove between the annular plate 25 and the pipe 1 to prevent dust from blocking the expansion of the elastic membrane 24 and affecting the sliding of the annular plate 25. This makes it easier to move the annular plate 25 when the elastic membrane 24 expands.

[0054] like Figure 9 As shown, a sealing plate 29 is rotatably installed inside one side of the pipe 1, and sealing balls 30 are installed on the outer wall of the sealing plate 29 and the bottom rotating shaft.

[0055] A T-shaped toothed plate 32 is slidably connected to one side wall of the mounting frame 3. A gear 31 is fixedly connected to the bottom of the rotating shaft of the sealing plate 29. The gear 31 meshes with the T-shaped toothed plate 32. A conductive spring 33 is installed between the T-shaped toothed plate 32 and the mounting frame 3.

[0056] Contact blocks 35 are installed between the opposite sides of the two sets of annular plates 25 and the bottom of the adjacent pipe 1, and the two adjacent sets of contact blocks 35 are connected in series with conductive springs 33.

[0057] By adopting the above technical solution, when there is air leakage on one side between the pipe 1 and the fixed ring 2, the gas can be discharged into the elastic membrane 24, which can increase the pressure inside the elastic membrane 24 and cause the elastic membrane 24 to expand. This can cause the annular plate 25 to slide outward. When the two sets of contact blocks 35 come into contact, the conductive spring 33 can be opened. The conductive spring 33 is energized and contracts, causing the T-shaped toothed plate 32 to move to the right. This allows the gear 31 to drive the sealing plate 29 to deflect and seal the inside of the pipe 1, achieving the function of self-sealing against air leakage, avoiding accidents, and thus improving safety performance.

[0058] like Figure 9 As shown, a third airbag 34 is installed between the T-shaped toothed plate 32 and the pipe 1, and the air outlet of the third airbag 34 is connected to the interior of the two sets of sealing balls 30.

[0059] By adopting the above technical solution, a one-way valve is installed at the air inlet end of the sealing ball 30. When the T-shaped toothed plate 32 moves to the right, it will squeeze the third airbag 34. This will allow the air outlet end of the third airbag 34 to blow air into the sealing ball 30, increasing the pressure inside, thereby improving the sealing performance and thus improving safety.

[0060] Instructions for use: Install this device on the outside of the connection point of duct 1 in a ventilated location. When airflow passes through the air inlet duct 4 on one side, the airflow will cause the two sets of fans 6 to rotate in the same direction. The rotation of the two sets of fans 6 will ventilate the installation frame 3 and blow the air out in the direction of the wind. The fans 6 drive the sliding rod 8 to rotate via the rotating rod 7, which in turn drives the rotating plate 9 to rotate via the T-shaped plate 14, thereby cleaning the surface of duct 1 and removing dust from the surface of duct 1, which will then be blown out in the direction of the wind. The sliding rod 8 rotates simultaneously with the airflow... When the movable abutment rod 12 rotates, and one end of the abutment rod 12 contacts the inclined block 11, the inclined surface of the inclined block 11 causes the abutment rod 12 to move to the left, which in turn causes the sliding rod 8 to move to the left and press against the elastic plate 10. When one end of the abutment rod 12 moves away from the inclined block 11, the elastic plate 10 pushes the sliding rod 8 to the right under its elastic action. At this time, the sliding rod 8 rotates while simultaneously moving back and forth left and right, thus enabling the elastic brush head 18 to clean the surface of the pipe 1 while rotating.

[0061] When the rotating plate 9 drives the elastic brush head 18 to rotate and contact the surface of the pipe 1, it will squeeze the elastic brush head 18, allowing the elastic brush head 18 to move upward on the T-shaped plate 14 and squeeze the spring 19. This allows the gas in the movable chamber 15 to be squeezed out through the air outlet 21 to clean the surface of the elastic brush head 18. When the elastic brush head 18 moves left and right on the surface of the pipe 1, the friction block 22 increases the friction with the pipe 1, allowing the elastic brush head 18 to deflect left and right during its left and right movement. This allows the elastic brush head 18 to drive the T-shaped plate 14 to deflect left and right within the slot 13 and squeeze the first airbag 16, thus achieving the first airbag... The air outlet of the bladder 16 blows air into the movable cavity 15 through the air outlet pipe 17, allowing the air to be discharged through the air outlet 21 to clean the surface of the elastic brush head 18. Simultaneously, during the left-right movement of the elastic brush head 18, the bottom end of the elastic brush head 18 is repeatedly squeezed, allowing the air in the cavity 23 to be discharged through the exhaust port 20. This achieves cleaning the surface of the pipe 1 while simultaneously blowing air onto its surface. When the rotating plate 9 rotates, causing the elastic brush head 18 to move away from the surface of the pipe 1, the elastic brush head 18 returns to its initial position under the force of the spring 19, vibrating the elastic brush head 18 and shaking off any residual dust.

[0062] As the sliding rod 8 rotates, it drives the abutment plate 27 to rotate. When the abutment plate 27 contacts the second airbag 26, it can compress the second airbag 26. The air outlet of the second airbag 26 blows air through the through groove 28 to the sliding groove between the annular plate 25 and the pipe 1 to prevent dust from clogging the elastic membrane 24 and affecting the expansion of the annular plate 25.

[0063] When there is a leak on one side between pipe 1 and fixed ring 2, the gas can be discharged into elastic membrane 24, which can increase the pressure inside elastic membrane 24 and cause elastic membrane 24 to expand. This can cause the annular plate 25 to slide outward. When the two sets of contact blocks 35 come into contact, the conductive spring 33 can be opened. The conductive spring 33 is energized and contracts, causing the T-shaped toothed plate 32 to move to the right. This can cause the gear 31 to drive the sealing plate 29 to deflect and seal the inside of pipe 1. At the same time, the T-shaped toothed plate 32 will squeeze the third airbag 34 while moving to the right. This can cause the air outlet of the third airbag 34 to blow air into the sealing ball 30 to increase the pressure inside, thereby improving the sealing performance.

[0064] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A gas pipeline leakage self-closing device, comprising a pipeline (1), wherein the pipeline (1) is provided with two sets, and a fixing ring (2) is fixedly connected to the outer side of the opposite side of the two sets of pipelines (1), and an installation frame (3) is fixedly connected to the outer side of the pipeline (1). Its features are: Also includes: The ventilation mechanism includes two sets of air inlet pipes (4) fixedly connected to the mounting frame (3). Each set of air inlet pipes (4) is fixedly connected to a support plate (5). Each set of support plates (5) is rotatably connected to a fan (6). A rotating rod (7) is fixedly connected between the two sets of fans (6). A sliding rod (8) is slidably connected to the rotating rod (7). A rotating plate (9) is evenly fixedly installed on the sliding rod (8). Ventilation openings are evenly provided on the mounting frame (3). By rotating the fan (6), the airflow in the mounting frame (3) can be directed to one side, and the pipe (1) in the mounting frame (3) can be ventilated and cooled. The reciprocating push mechanism includes an elastic plate (10) rotatably mounted on one side of the sliding rod (8), the elastic plate (10) being elastically slidably connected to the support plate (5), and a stop rod (12) fixedly connected to one side of the sliding rod (8) near the elastic plate (10). One end of the stop rod (12) is in contact with an inclined block (11), and the inclined block (11) is fixedly connected to the support plate (5). The ventilation mechanism and the reciprocating push mechanism cooperate with each other. The sliding rod (8) can be driven to reciprocate left and right while the fan (6) rotates, so as to better clean the surface of the pipe (1) in the future. Elastic membranes (24) are installed between the two sides of the fixed ring (2) and the pipe (1). Annular plates (25) are fixedly installed on both sets of elastic membranes (24). Both sets of annular plates (25) are slidably connected to the fixed ring (2) and the adjacent pipe (1). A second airbag (26) is installed on the top of the fixed ring (2). A through groove (28) is connected to the sliding groove between the annular plate (25) and the fixed ring (2). The other end of the two sets of through grooves (28) is connected to the air outlet of the second airbag (26). A stop plate (27) is provided above the second airbag (26). The stop plate (27) is fixedly connected to the sliding rod (8).

2. A gas pipeline leakage shut-off device according to claim 1, characterized in that: Each group of rotating plates (9) has a slot (13) at the other end, and a T-shaped plate (14) is rotatably installed in each group of slots (13). A first airbag (16) is installed between each group of T-shaped plates (14) and the inner walls of both sides of the slot (13). An elastic brush head (18) is slidably installed at the bottom of each group of T-shaped plates (14). Each group of T-shaped plates (14) has a movable cavity (15). An air outlet pipe (17) is installed at the air outlet end of each group of first airbags (16). The other end of each group of air outlet pipes (17) is connected to the interior of the adjacent movable cavity (15). Air blowing ports (21) are evenly opened at the bottom of each group of T-shaped plates (14).

3. A gas pipeline leakage shut-off device according to claim 2, characterized in that: Each set of elastic brush heads (18) has a cavity (23) at the bottom end, and each set of elastic brush heads (18) has an exhaust port (20) at the bottom end. Each set of elastic brush heads (18) has a friction block (22) fixedly connected to the bottom outer wall.

4. A gas pipeline leakage shut-off device according to claim 2, characterized in that: Each elastic brush head (18) in each group is equipped with a spring (19) between it and the inner top wall of the adjacent movable cavity (15).

5. A gas pipeline leakage shut-off device according to claim 1, characterized in that: A sealing plate (29) is rotatably installed inside the pipe (1) on one side, and sealing balls (30) are installed on the outer wall of the sealing plate (29) and the bottom rotating shaft.

6. A gas pipeline leakage shut-off device according to claim 5, characterized in that: A T-shaped toothed plate (32) is slidably connected to one side wall of the mounting frame (3), and a gear (31) is fixedly connected to the bottom of the rotating shaft of the sealing plate (29). The gear (31) meshes with the T-shaped toothed plate (32), and a conductive spring (33) is installed between the T-shaped toothed plate (32) and the mounting frame (3).

7. A gas pipeline leakage shut-off device according to claim 6, characterized in that: Contact blocks (35) are installed between the opposite sides of the two sets of annular plates (25) and the bottom of the adjacent pipe (1), and the two adjacent sets of contact blocks (35) are connected in series with the conductive spring (33).

8. A gas pipeline leakage shut-off device according to claim 6, characterized in that: A third airbag (34) is installed between the T-shaped toothed plate (32) and the pipe (1), and the air outlet of the third airbag (34) is connected to the interior of the two sets of sealing balls (30).

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